Method of and apparatus for casting



Dec. 9, 1924. 1,518,188

E. o. EKSTEDT METHOD OF AND APPARATUS FOR CASTING Filed Oct. 4, .1922

INVENTOR W/WEY,

Patented Dec. 9, 1924.

UNITED STATES ERNEST D. EKSTEDT, OF EAST ST. LOUIS, ILLINOIS.

METHOD OF AND APPARATUS FOR CASTINGL.

Application filed October 4, 1922. Serial No. 592,303.

To all whom it may concern:

Be it known that I, ERNEST D. EKSTEDT, a citizen of the United States,residing at the city of East St. Louis, in the county of St. Clair andState of Illinois, have invented certain new and useful Improvements 'inMethods of and Apparatus for Casting, of which the following is aspecification.

The object of this invention is to obviate the necessity of the use of adrier in pre paring sand-molds for irregular-shaped objects. The driersthemselves are an item of expense and the time and labor in using theminvolve further expenditure of money, which is rendered unnecessary bythe present invention.

A further object of this invention is to improve the art of formingcores without the use of supporting devices to maintain their form whiledrying.

More particularly, this invention embodies the conception of formingcores to be used in casting metal, said cores to be dried without theuse of such supporting devices, as above mentioned, and in such mannerthat breakage of the cores will be prevented while drying.

In the accompanying drawings forming part of this specification, inwhich like numbers of reference denote like parts wherever they occur,

Figure l is a plan view of a drier;

Figure 2 is a side elevation of a sand-core broken by its own weightafter an attempt to dry the same without the use of a drier and withoutthe use of this invention; and

Figure 3 is a side elevation illustrating this invention.

hen by the use of patterns a sand-core has been made in order to mold orcast in metal the counterpart of the subject-matter of Figure 2 or otherirregular-shaped casting, it is necessary, in order to prevent itsbreaking of its own weight as shown in Fgure 2, to inclose the same in atwo-piece drier 1, such as shown in Figure 1. If this is not done, thereis no position in which the form shown in Figure 2 or the like, made ofsand, can be laid or placed where it will not lose its shape or break ofits own weight in the manner shown in Figure 2. For the reasons ofexpense given above it is desirable to depart from the practice of usinga drier.

The use of a drier necessarily involves the manufacture of that elementfor each core which is made. Inasmuch as cores vary considerably inconfiguration and many of them are of complicated shapes, it isobviously extremely expensive to manufacture driers to fit various moldsand to manufacture them in such manner that they will be easily attachedto the core and to be of such a close fit as to maintain the shape ofthe core.

The applicant is not aware of any known process of forming cores whereinthe cores are dried without the use of such drier as above mentioned.

The herein-described method of forming the sand-core makes itunnecessary to use the drier of Figure 1 or any other, and allows thesand, forming the core shown in Figure 3, to be baked just as formed andwithout the use of a drier or similar means.

The form depicted in Figure 3 is only one of many forms in theproduction of which this improved method is beneficial. The commoncharacteristic of the forms that will be most benefited by this methodare those in which the weight is irregularly distributed.

By comparison of Figures 2 and 3 it will be perceived that the line 2 ineach is the same. When this invention is used the cores 3 are united bya union 4 having a depending pedestal or base 5, the said base 5 and allparts of the union 4 being formed of the same material as the cores 3,namely, green sand to be baked. After the baking of a core like Figure 3the union 4 is knocked away, leaving only the core proper 3, which is tobe used in the molding operation. Forms like Figure 3 can be bakedwithout a drier. The connection between the inner ends of the cores 3and the union 4 is so intimate that there is no tendency to break at thejunction between them or at the point 6 or elsewhere, and the provisionfor the base 5 resting at a point even with the edges 7 of cores 3prevents sagging in the middle.

While only two cores are shown in Figure 3 yet the same principle can beutilized in forming a stick containing a larger plu- 1 rality of suchcores, which principle is that of uniting any plurality ofirregular-shaped cores together by means of unions of the same materialand having extensions or bases interspersed between them like base 5 andadapted to rest upon the same level as the cores to be dried. 7

Having thus described this invention, I hereby reserve the benefit ofall changes in form, arrangement, order, or use of parts, as it isevident that many minor changes may be made therein without departingfrom the spirit of this invention or the scope of the following claims.

I claim:

l. The herein-described method of forming green sand cores for dryingconsisting in uniting a plurality thereof together with green sand andforming a base at such juncture adapted to rest on the same level as thecores.

"2. The herein-described method of forming green sand cores for dryingconsisting in uniting a plurality thereof together with green sand ofthe same texture and forming a base at such juncture adapted to rest onthe same level as the cores.

3. The herein-described method of preparing green sand cores for dryingconslstlng in forming therewith a green sand

